Risk Analysis on Agricultural Drought Disaster in Henan Province

Treat Zhengzhou, Xinxiang, Sanmenxia, Shangqiu and Nanyang as a typical area of Henan province, start with four factors include exposure of the risk factor, hazard-affected body, environmental vulnerability and drought disaster reduction ability to analysis the reasons of agricultural drought risk. Based on the theory of disaster science this paper use analytic hierarchy process (AHP), weighted comprehensive evaluation method and natural disaster risk index to build agricultural drought disaster risk assessment system. Then according to the weather, agriculture, social and economic data and use the optimal segmentation method to evaluation drought disaster risk of the typical city in Henan.